Abstract: A ball racket includes a head frame for racket stringing, a shaft unit including first and second tubes non-rotatably fitted to each other to be moved relative to each other along an axis, an actuator disposed within the first tube and having an actuating end and a shank body, an expandable shell disposed between the actuating end and the first tube, and a force transmitting mechanism disposed between the expandable shell and the first tube. Counterclockwise rotation of the actuating end causes the expandable shell and thus the first tube to expand radially so as to generate increased friction between the first and second tubes to thereby guard against relative axial movement between the first and second tubes. Clockwise rotation of the actuating end permits the first tube to axially move relative to the second tube so as to adjust the length of the shaft unit.

Abstract: A batting training device includes a telescopic prop, a base, a plurality of support members, and a limiting unit. The telescopic prop has top and bottom ends. The base is connected to the bottom end of the prop. Each of the support members has a pivot end pivoted to the base, and a ground contacting end opposite to the pivot end. Each of the support members is pivotable upwardly relative the base from an unfolded position to a folded position. The limiting unit is provided on the base and has a plurality of blocking portions. The blocking portions are movable relative to the base between a blocking position and an unblocking position.

Abstract: A baseball bat includes a tubular member having a slide rail, a tubular hitting portion sleeved on the tubular member, a handle inserted telescopically in the tubular member, and a locking unit having a first locking member provided on the handle and a second locking member disposed nonrotatably within the tubular member and slidable along the slide rail. The second locking member includes a main body having a tapering hole and an internal thread. The first locking member has an externally threaded tapering portion insertable into the tapering hole and engageable with the internal thread. The main body locks the handle against movement and permits the same to move relative to the tubular member when the externally threaded tapering portion is rotated threadedly in the tapering hole in an inward or outward direction.

Abstract: A telescopic batting training apparatus includes an upright support, and a central base unit. The upright support includes a lower support post, an upper support post telescopically connected to the lower support post, a locking unit for restricting telescopic movement of the upper support post relative to the lower support post, and a ball receptacle mounted on top of the upper support post. The base unit includes a tubular member sleeved around the lower support post, and a plurality of radial legs having inner ends pivotally connected to the tubular member and outer ends opposite to the inner ends. The radial legs are turnable between a stretching position, in which the outer ends move away from the lower support post, and a folding position, in which the outer ends move toward the lower support post.